Are we ever going to get a solid reason for why Buy or Sell and Credit Card were retired beyond "we just didn't like them?"
Roger talked about Buy or Sell's retirement not too long ago on his
Facebook page."I found the game not particularly fun...it was long...and the concept of buying or selling a little off (how does one 'sell' a prize if one hasn't bought it...but one doesn't really own it because he's given the option to buy it)"
I don't recall ever getting an official answer about Credit Card, but the most likely reason is that it's a very long game and the show's fighting for every second. Because long games are much harder to schedule in the lineup, they'd need to get a lot of bang for its buck to justify their keeping around on the show.
The nature of the game meant that the five prizes usually needed to be relatively cheap compared to prizes offered in other multiprizers like, say, Most Expensive. The average Credit Card prize package in Season 36 was $4,640; the average Most Expensive package was $6,047.
14 out 25 prizes offered in Credit Card that season were under $1,000; only out of 75 prizes offered in Most Expensive were under $1,000. The desire for the new staff to offer "bigger and better prizes" could have played a factor.
The "insert the card to find the credit limit" bit was the most fun thing about the game, but Drew didn't always do it, and of course, it took up even more of the show's airtime.